Where can I find the picture that is used in all the default mission briefings?

[Jaktaz]

The one with the Russian helmet, breathing apparatus, gloves, map, kneepad, and watch all lying in a pile? I think it would be a cool wallpaper.

[Buzzles]

...\Eagle Dynamics\DCS World\Mods\aircraft\MiG-21BIS\ImagesGUI

 

It's not very big though, 512x512.